Hot water tank assembly



Nov. 23, 1943. w. E. CRAWFORD HOT WATER TANK ASSEMBLY Filed May 18, 1942 William E. Crazzy'afd INVENTOR v ATTORNEY.

1 meme Nov. 23, 1943 UNITED STATES: PATENT" OFFICE,

. 2,225,174 nor warns. ran: assailant William 1!. Crawford, Womble, Wm aalignor a a. 0. Smith corporation. Milwaukee, Win,

a c rporation of New York Application May is, 104:, Serial is. 443,431 2 Claims. (ca 224-) This invention relates to a hot assembly and more particularly to the assembly of the head and shell'of a tank that is lined with ceramic enamel or other corrosion resistant material for protection against corrosive action by the fluid contained in the'tanlr in service.

The principal object of the present invention is to provide a hot water tank assembly m which corrosive disintegration by the contained fluid of the weld metal of the Joint between parts is precluded by providing an improved fluid tight joint that prevents circulation of the fluid to the weld.

Another object is to provide an assembly of a hot water storage tank in which the joints are specially reinforced to prevent rupture.

Other objects will appear from the following description of embodiments of the invention illustrated in the accompanying drawing.

In the drawing:

Figure 1 is a longitudinal section through a hot water tank embodying the invention;

Fig. 2 is an enlarged section through a Joint between the upper head and body of the tank: Fig. 3 is an end view of a head and shell assembled together; and

Fig. 4 is a section similar to Fig. 2 and showing a modified embodiment of the invention.

Referring to the drawing there is illustrated a hot water storage tank having a shell I an upper head 2 and a lower head 3. The description hereafter is limited to the manner of joining the upper head 2 to the shell I, it being understood that thedescription equally applies to the manner of connecting. the head 2 and shell I.

The shell I has a generally cylindrical shape and is fabricated from sheet metal of a strength and thickness suitable to resist the-pressure exerted by contained fluid when the tank is in service. The ends of the shell I are outwardly flared in the fabrication operation to Provide the substantially straight outwardly eirtending flanges 4 and 5 lying in a plane at right angles to the axis of the shell.

The interior surface of the shell, including the inner surface 01' the flanges 4 and I, is provided with the corrosion resistant lining 6. This lining may be of any suitable material that has the corrosion resistant qualities desired but preferably consists of ceramic enamel frit that is applied to the tank surface exposed to the contained fluid and then fused thereto by heating the shell to the firing temperature of the enamel. The upper head 2 is preferably formed in a water tank convex shape and is made from steel or other metal similar to that employed in the shell I.'

The head 2 is provided at its skirt portion with the substantially straight outwardly extending flange I that corresponds, in diameter and direction with the flange 4 of the shell I.

The interior surface of the head 2, including the inner surface of the flange '|,is covered with the corrosion resistant lining 8. As in the case of the lining 0 of the shell I, the lining 8 is preferably of a ceramic enamel material specifically adapted to resist the corrosive action of con- 'tained fluid and it is applied and fused in the same manner as lining 6.

After the head 2 and the shell Ihave been completed as described they are ready for assembly. In the assembling operation the head 2 is flrst disposed in, axial alignment with the shell I and the two are brought together with their flanges in circumferential alignment so that the lining l on the flange I engages the lining 6 of the flange 4. While the head 2 is held in tightly fitting position with respect to the shell I, weld metal 2 is circumferentially deposited, preferably by electric arc welding, at the outer edges of the flanges 4 and I of the shell and head to join these members together into an integral structure. I

The flanges of the head and shell provide a relatively large area in which the lining 6 of the shell and lining 8 of the head overlap each other for a substantial distance to eifectively seal the approach to the weld metal 9 by the liquid contained within the ta The substantially thin gasket I ll'oi' corrosion resistant material such as asbestos, glass flber or soft metal may be disposed between the flanges of the head and shell to additionally seal the approach to the weld 9. If the gasket I0 is,employed it may be assembled with the tank by applying it to the flange 4 of the shell and then holding it in place until the flange I of the head is pressed into position. The making of the weld I securely holds the gasket between the flange 4 of the shell and flange 'I of the head.

In place of the gasket Ill. it is possible to seal the linings of the flanges together by 'interfusing the same, preferably prior to welding, in the manner described in applicant's co-pending aphoop cool the open iisose edges shaped to com together.

joint between the heecl end shell.

v oi hot water a pressure oi the fluid in service tends to move the heed sway irom the shell with a resultant ooem log ol the joint thereloetweem. To prevent the cee of the joint in this manner and to main: the tight eogagent cetween the overlapping of the heed 3 and shell 3, the hoop or clamp ll ls provided.

It is preferred that the hoop ll be composed of two parts, each part us-v o eecircle around the circumference oftthe 1.: Tlrehooo Ell li lies 2, 3sw=siiaped .24; cross section with the closes web or: the out-er cirereoce oi the "form to the epprosch oil the wall of the tank to the flanges and l. The hoop is stressed lo sllchl5- a manner cs to produce eprellete'rmlned' oressure when ffcrceo over the fiorlllec soothe outside wall of the ta by the engesll and 3 In assembling the hoop ll vvlth tools, the

two respective parts oi -the hoop ere .Jorced over the ring formed by the flanges l emi J and then I the ends of the parts of the hoop are welded together by the welds l2 as lllustraterlio Fi 3. The welds 92 may be made by any suitable method of welding and serve to hold the hoop ll in tight engagement erouncl the circerentlol The hoop ll exerts colnwerdly exiallv directed; clamping pressure that is predetermined to be so suficierzt to ofiset and overcome the ootvrercilyaxially directed pressure of the contained fiuiol This prevents the joint between the heed end shell from being spg open. The Home 4% ol the shell is held in tight'overlepp engagement with the limos e oil the lleocl and the contents of the tank. erepreventecl firom flowing contact with the weld 9. The hoop l l also operates in the some manner in the event that llle gasket employed between the flanges cl tlaelxeerl 4% hell, L 5'5 be employed instead of the hoops M to provide the clemoing pressure desires". ct the joint between the heeri cool shell or as shown in Fla, illustretingencther emboent of the levee-bloc, the clps l3 may m utilized to per form the clamping function.

Toe clamps l3 may be lei-med with e shape sloaw r to the hoops llto fit the contour of the of the f at the'jolnt between the head 5 muesli I cm shell. The clamps, however, consist of two seperece ring parts, one l: :"T'U'E disposed below the welded flanges o the other part being disposed sleeve the flanges The inwardly directed exlol pressure is provided in the clamps by employscent of the bolts fill cseci slightly; removed izrom the weld 9 to bolt together the two ports 1 so The invention has been specifically @escrl as applied to the 30 of the heaos sod shells Elle, however, well {sole cosmos who othertcnilzs where special lclzrlcetion methods leave been employed so provide e. strong loint cetween a head one shell with often a. considerable secrlflce of see iii the l tlorl also orovides e strong, durable joint that is doubly es: einst rupture by em- ;olcvment of at eirerenflel weld in comblnelies with clampingmeans to hold tlie'lresd and shell together. 1

H-Lull; oi the invention may be Z ferious employed \vl the scope of the scccmpe claims. cl:

similarly lined and having an outwardly extendmg fienge at its s portion similar to that of the flange on sold shell, the flange of the head being supported over a substantial overlapping ores loy the fie of the end portion of said shell, e. circumferential weld joining said flanges at their circumferential edges and sealing the l of the flange oi the shell'egeinst the linol the flange of the heed in said overlapping area, to prevent circulation of fluid to the metal at the joint, and e, hoop disposed to clamp said flanges against deflection and prevent separation of the overlapping linings et the joint by pressure directed exiclly outwardly against the heed cl sslcl tools by the contained fluid.

A hot water tools assembly comprising e generally cylindrical shell leaving an outvgeraily exteoolng :4- sion resistant .11; of ceramic enamel to prolog lie at lts t portion or to that of the fleece-co sold shell, the flange ofthe'neecl being supoor over ewssubstentlel overlapping ores by the flange oi the end portion of said shell, s corrosion resistant filler material disposed in the overlapping eree tween the flanges of the head and; shell in vtight agement there= with, e eircerential weld joining the head and shell integrally together and sealing the said filler material in the joint therebetween, and a hoop to clamp said flanges axially inwev lav-e oretletermined-pressure to prevent injury to the enamel luv deflection of said flanges soc counteract the outwardly directed axial pressure ex gainst the head or the tank by the contents thereof.-

together or e at its end portion and e corro- The lnvenv 

